package cn.felord.poi.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * @author Dax
 * @since 0:41  2018/5/18
 */
@Configuration
@EnableAsync
public class AsyncConfig {

    @Bean
    public Executor myExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        //线程池维护线程的最少数量
        int corePoolSize = 10;
        executor.setCorePoolSize(corePoolSize);
        //线程池维护线程的最大数量
        int maxPoolSize = 30;
        executor.setMaxPoolSize(maxPoolSize);
        //缓存队列
        int queueCapacity = 8;
        executor.setQueueCapacity(queueCapacity);
        executor.setThreadNamePrefix("mqExecutor-");
        // rejection-policy：当pool已经达到max size的时候，如何处理新任务
        // CALLER_RUNS：不在新线程中执行任务，而是由调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy()); //对拒绝task的处理策略
        //允许的空闲时间
        int keepAlive = 60;
        executor.setKeepAliveSeconds(keepAlive);
        executor.initialize();
        return executor;
    }
}
